UNSPECIFIED (2001) Improvements to SPIHT for lossy image coding. In: 8th IEEE International Conference on Electronics, Circuits and Systems, SEP 02-05, 2001, ST JULIANS, MALTA.

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Abstract

We propose five measures to improve the SPIHT (Set Partitioning In Hierarchical Trees) algorithm for lossy image coding. First, a new type of tree with virtual root is introduced to hold more wavelet coefficients. Second, an extra matrix is used to speed up the judgement of the significance of trees. Third, a pre-processing is done to smooth the coefficients before SPIHT encoding. Fourth, some predictable bits are omitted from the encoder output by rearranging the coding procedure. Finally, the quantisation is offset from the middle-point according to the statistics. Our experiments show that these improvements increase the PSNR (Peak Signal to Noise Ratio) by up to 5 dB at very low rates, and the average improvement at 0.2 - 1 bit/pixel is about 0.5 dB for the standard test images used. Despite the performance gain, the computation complexity is also reduced.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TK Electrical engineering. Electronics Nuclear engineering
Journal or Publication Title:	ICECS 2001: 8TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS, VOLS I-III, CONFERENCE PROCEEDINGS
Publisher:	IEEE
ISBN:	0-7803-7057-0
Date:	2001
Number of Pages:	4
Page Range:	pp. 1363-1366
Publication Status:	Published
Title of Event:	8th IEEE International Conference on Electronics, Circuits and Systems
Location of Event:	ST JULIANS, MALTA
Date(s) of Event:	SEP 02-05, 2001
URI:	http://wrap.warwick.ac.uk/id/eprint/10300

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